Apparatus for positioning journal assemblies in pulverizers

ABSTRACT

An apparatus for removing and replacing journal assemblies in pulverizers comprising a frame adapted to be mounted adjacent the opening in a side wall of the pulverizer and a carriage which is mounted on the frame for pivotal movement to swing the journal assembly between positions within and without the housing and for movement away from the pulverizer to move the journal assembly clear of the housing for servicing.

United States Patent [191 Moro [4 June 25, I974 APPARATUS FOR POSITIONING JOURNAL ASSEMBLIES IN PULVERIZERS Dominik J. Moro, York, Pa.

American Chain & Cable Company, Inc., New York, NY.

Filed: Mar. 29, 1973 Appl. No.: 345,862

Inventor:

[73] Assignee:

US. Cl 29/200 D Int. Cl B23p 19/00 Field of Search 29/200 D, 200 B, 200 R References Cited UNITED STATES PATENTS 3,540,254 Bode, Jr 29/200 D 3,566,498 3/l97l Kato et al. 29/200 D Primary ExaminerThomas l-l. Eager Attorney, Agent, or FirmBames, Kisselle, Raisch &

Choate [57] ABSTRACT An apparatus for removing and replacing journal assemblies in pulverizers comprising a frame adapted to be mounted adjacent the opening in a side wall of the pulverizer and a carriage which is mounted on the frame for pivotal movement to swing the journal assembly between positions within and without the housing and for movement away from the pulverizer to move the journal assembly clear of the housing for servicing.

22 Claims, 12 Drawing Figures PATENTED JUNZ 51974 SHEET 6 OF 6 2 6 Mm. V

O o ORV WV APPARATUS FOR POSITIONING JOURNAL ASSEMBLIES IN PULVERIZERS This invention relates to pulverizers and to servicing of pulverizers.

BACKGROUND OF THE INVENTION In pulverizers for pulverizing material such as coal as used in steam plants, the construction of the pulverizer is very large and the maintenance of such pulverizers causes considerable down time particularly because of the difficulties in removing the roller journal assemblies used therein. Such roller journal assemblies are mounted inside the housing of pulverizer and may have a weight of 16,000 pounds each with the center of gravity being approximately 3 feet inside of the housing. Accordingly, the removal and installation of these roller journal assemblies is difficult, time-consuming and dangerous.

Accordingly, among the objects of the invention are to provide an apparatus whereby the roller journal assemblies can be removed more easily in less time and in a more safe manner.

SUMMARY OF THE INVENTION In accordance with the invention, an apparatus is mounted adjacent the opening in a wall of the housing of the pulverizer. The apparatus includes for swinging each roller assembly through the opening and thereafter moving the roller assembly horizontally outwardly so that it can be serviced. The reverse procedure is performed for installing the roller journal assembly in the pulverizer.

DESCRIPTION OF THE DRAWINGS FIG. I is a fragmentary part sectional elevational view of a pulverizer to which the invention is applied.

particularly FIG. 2 is a fragmentary part sectional view showing the apparatus embodying the invention in position on a pulverizer.

FIG. 3 is a fragmentary sectional view taken along the line 3-3 in FIG. 2.

FIG. 4 is a fragmentary sectional view taken along the line 4-4 in FIG. 3.

FIG. 5 is a fragmentary part sectional side elevational view of the apparatus shown in FIG. 2.

FIG. 6 is a fragmentary view on an enlarged scale of a portion of the apparatus shown in FIG. 2, parts being broken away.

FIG. 7 is a fragmentary sectional view on an enlarged scale taken along the line 7-7 in FIG. 6.

FIG. 8 is a fragmentary sectional view similar to FIG. 2 showing the parts in a different operative position.

FIG. 9 is a fragmentary sectional view similar to FIG. 8 showing the parts in a different operative position.

FIG. 10 is a fragmentary plan view of a portion of the apparatus shown in FIG. 9.

FIG. 11 is a fragmentary the line 11-11 in FIG. 10.

FIG. I2 is a fragmentary sectional view taken along the line l212 in FIG. 8.

DESCRIPTION Referring to FIG. 1, the invention relates to pulverizers such as are used for pulverizing coal for use in steam plants. Such pulverizers include a housing 21 and sectional view taken along as a part of the structure incorporate circumferentially spaced roller journal assemblies 22, each of which is mounted by spaced trunnions 23 with the center of gravity CG of the roller journal assembly 22 within the housing 21. The pulverizers are quite large and the roller journal assemblies are quite heavy being on the order of 16,000 pounds each. The relative size of the pulverizer can be readily understood by reference to FIG. 1 wherein the height above a platform 24 is approximately 6 feet.

Each roller assembly 22 is maintained in position by a removable closure or cover 25 held in position by bolts 26 and incorporating adjustable pressure pads 27, 28 that bear against corresponding projections 29, 30 on the roller journal assembly 22.

In accordance with the invention, the closure 25 is removed and an apparatus 35 is placed in position on the opening 36 formed by removal of the closure (FIG. 2). The apparatus 35 includes a frame 37 and a dolly or carriage 38 that is adapted to be connected to the roller journal assembly 22 to swing the roller journal assembly through the opening 36 and thereafter move it radially outwardly of the housing as presently described.

Referring to FIG. 5, the frame 37 includes a flat vertical plane 39 that is adapted to be mounted about the opening 36 by bolts 40 extending into the threaded holes which normally receive the bolts 26 for holding the closure 25. A horizontal base plate 41 extends at a right angle from a plate 39 and gusset plates 42 extend between the plate 39 and base plate 41. The central portion 39a of the plate 39 is cut away to provide clearance for the roller journal assembly to pass therethrough.

The carriage 38 includes side plates 43 which are interconnected by spaced cross bars 44, 45. Each side plate 43 is formed with an arcuate recess 46 having openings 47 therein through which bolts 48 can be threaded to engage the trunnion of the journal assembly (FIG. 6).

Each side plate 43 further includes a pad or projection 49 having an arcuate recess 50 for engaging a pivot shaft 51 extending inwardly from each gusset plate 42. Each pivot shaft is rotatably mounted on its gusset plate 42 such that it extends horizontally within an opening 39b in plate 39 and in the plane thereof. A roller 53 having a V-shaped peripheral configuration 54 is rotatably mounted on each side plate 43 adjacent the projection 49. As shown in FIGS. 3 and 4, an adjustable pressure pin 55 is provided on the cross bar 44 for engagement with the projection 30 of the journal roller assembly 22. A pair of linear hydraulic cylinders 56 are provided. Each cylinder is pivoted at one end to a bracket 57 on the plate 39 and has its piston shaft 59 pivoted to a bracket 58 on the carriage 38. By extending the shaft as shown in FIG. 8, the roller journal assembly can be swung from the position shown in FIG. 2 to the position shown in FIG. 8 through the openings 36, 39a. In order to lock the carriage for pivotal movement, a retainer plate 60 is rotatably mounted on at least one shaft 51 and is movably axially into and out of engagement with a pin 61 on side plate 43 of carriage 35 (FIG. 6).

In order to provide proper vertical alignment of the carriage 35 with the journal assembly prior to movement, an eccentric cam 62 is provided on each shaft 51 and is engageable with an arcuate recess 63 on each side plate 43 adjacent pad 49. The eccentric cam 62 is adapted to be rotated by a lever 66 fixed to each shaft 51 so that by swinging the levers 66, the vertical relationship of the carriage 35 with respect to the frame 37 can be changed. The lever is provided with openings 67 that are adapted to be selectively aligned with arcuately spaced openings 68 on the gusset plate 42 to adjust the position of the carriage 35 angularly of the frame 37. A removable pin 69 retained by a chain 69a is provided for insertion through properly aligned openings 67, 68. The lever 66 is engaged with the shaft through a spline connection 70. If full travel of handle 66 does not provide sufficient adjustment, the handle 66 may be disconnected at the spline connection 70, moved angularly and reengaged with shaft 51 through the spline connection 70 to increase the range of adjustment.

After the roller assembly has been moved to the position shown in FIG. 8, the retainer 60 is moved axially out of engagement with pin 61 to the broken line position shown in FIG. 7. In this position, the rollers 53 on the carriage 35 have been brought into position adjacent V-shaped tracks 75 on the base plate 41. A removable rail 76 is then bolted in position above a slide 77 fixed on each side plate 43 on the carriage 35 to hold the carriage 35 downwardly. The upper end of the cylinders 56 are disconnected from the brackets 57 and reconnected to brackets 78 spaced vertically below on the plate. The cylinders 56 are then extended causing the carriage 35 to be moved radially outwardly away from the housing 21 to bring the roller journal assembly into a position for lifting by a sling formed by cable slings 79, 80 (FIG. 9). Stops 81 on carriage 35 engages a stop bar 82 on the frame 37 to limit the outward movement of the carriage 35 (FIGS. 5, 10, 11).

The roller journal assembly can thus be readily removed for service. Upon completion of the service, the steps are reversed as follows: the roller journal assembly is positioned on the carriage 35, the carriage 35 is moved horizontally inwardly by reversing the operation of cylinders 56 the rail 76 is removed, the retainer 60 is then placed in position, the cylinders 56 reconnected to the brackets 57 and the cylinders actuated to swing the roller journal assembly inwardly to its original position shown in FIG. 2. Hooks 83 are provided on the frame 37 for lifting the apparatus into and out of position adjacent the pulverizer.

I claim:

1. For use with a pulverizer comprising a housing having a plurality of circumferentially spaced journals therein, and a removable closure adjacent each said journal,

an apparatus comprising frame means adapted to be mounted adjacent the housing,

and means mounted on said frame means for engaging the journal assembly and swinging the journal assembly outwardly through the opening in said housing and for thereafter moving said journal assembly away from said housing to clear the opening so that the journal assembly may be made accessible for servicing.

2. The combination set forth in claim 1 wherein said last mentioned means comprises a carriage,

means selectively engaging said carriage and pivoting said carriage tosaid frame means for guiding said carriage for movement such as to move the journal assembly from a position within said housing to a position externally of said housing and back,

means selectively engaging said carriage to said frame means for guiding said carriage for movement away from said housing such that the journal assembly can be moved clear of the housing after being moved out of said housing.

3. The combination set forth in claim 2 including a motor, means on said frame for selectively connecting said motor between said frame means and said carriage such that in one position said motor tends to pivot said carriage with respect to said frame means and in another position said motor tends to reciprocate said carriage relative to said frame means.

4. For use with a pulverizer comprising a housing having a plurality of circumferentially spaced journals therein, and a removable closure adjacent each said journal,

an apparatus for removing and replacing the journal assembly comprising a frame,

means for removably supporting said frame on said housing adjacent the opening formed by removal of a closure,

a carriage,

means for connecting said carriage to a journal assembly,

means for guiding said carriage for movement such as to move the journal assembly from a position within said housing to a position partly externally of said housing and back,

andmeans for guiding said carriage for movement away from said housing such that the journal assembly can be moved clear of the housing after being moved out of said housing,

and means for actuating said carriage during its movement.

5. The combination set forth in claim 4 wherein said means for guiding said carriage for moving the journal assembly between positions within and partly externally of said housing comprises pivot means for pivotally mounting said carriage on said frame.

6. The combination set forth in claim 5 including means releasably connecting said pivot means.

7. The combination set forth in claim 5 wherein said means for pivoting said carriage with respect to said frame includes means for varying the position of the carriage with respect to said frame.

8. The combination set forth in claim 6 wherein said means for guiding said carriage for movement away from said housing comprises a track on said frame and means for guiding said carriage along said track.

9. The combination set forth in claim 8 wherein said means for actuating said carriage comprises a fluid motor extending between said frame and said carriage.

110. The combination set forth in claim 9 including means on said frame for selectively connecting said motor to said frame such that in one position said motor tends to pivot said carriage with respect to said frame and in another position said motor tends to reciprocate said carriage along said track.

11. The combination set forth in claim 10 wherein said means connecting said carriage to said journal assembly comprises a portion adapted to be connected to a portion of the journal assembly.

12. The combination set forth in claim wherein said means defining said track comprises spaced members on said frame,

said carriage having rollers thereon engageable with said track.

13. The combination set forth in claim 12 wherein said means for guiding said carriage along said track comprises a hold down rail removably mounted on said frame engaging said carriage and urging said carriage downwardly toward said track.

14. For use with a pulverizer comprising a housing having a plurality of circumferentially spaced journals therein and a removable closure adjacent each said journal, the improvement comprising an apparatus for removing and replacing the journal assembly comprising a frame,

means for removably supporting said frame on said housing adjacent the opening formed by removal of a closure,

a carriage,

means for connecting said carriage to a journal assembly,

means engageable with said frame for guiding said carriage for movement such as to move the journal assembly from a position within said housing to a position partly externally of said housing and back,

and means engageable with said frame forguiding said carriage for movement away from said housing such that the journal assembly can be moved clear of the housing after being moved out of said housing.

15. The combination set forth in claim 14 wherein said means for guiding said carriage for moving the journal assembly between positions within and partly externally of said housing comprises means for pivotally mounting said carriage on said frame.

16. The combination set forth in claim 15 including means releasably connecting said pivot means.

17. The combination set forth in claim 16 wherein said last-mentioned means comprises axially movable engaging means interconnecting said frame and carriage.

18. The combination set forth in claim 17 wherein said last-mentioned means comprises a pivot shaft on said frame, said axially movable member being mounted on said shaft and engageable with said carriage.

19. The combination as set forth in claim 18 wherein said means for varying the position of the carriage with respect to said frame.

20. The combination set forth in claim 16 wherein said means for guiding said carriage for movement away from said housing comprises a track on said frame and means for guiding said carriage along said track.

21. The combination set forth in claim 20 including a fluid motor, means on said frame for selectively connecting to different positions said motor to said frame such that in one position said motor tends to pivot said carriage with respect to said frame and in another position said motor tends to reciprocate said carriage along said track.

22. The combination set forth in claim 21 wherein said means for guiding said carriage along said track comprises a hold down rail engaging said carriage and urging said carriage downwardly toward said track. 

1. For use with a pulverizer comprising a housing having a plurality of circumferentially spaced journals therein, and a removable closure adjacent each said journal, an apparatus comprising frame means adapted to be mounted adjacent the housing, and means mounted on said frame means for engaging the journal assembly and swinging the journal assembly outwardly through the opening in said housing and for thereafter moving said journal assembly away from said housing to clear the opening so that the journal assembly may be made accessible for servicing.
 2. The combination set forth in claim 1 wherein said last mentioned means comprises a carriage, means selectively engaging said carriage and pivoting said carriage to said frame means for guiding said carriage for movement such as to move the journal assembly from a position within said housing to a position externally of said housing and back, means selectively engaging said carriage to said frame means for guiding said carriage for movement away from said housing such that the journal assembly can be moved clear of the housing after being moved out of said housing.
 3. The combination set forth in claim 2 including a motor, means on said frame for selectively connecting said motor between said frame means and said carriage such that in one position said motor tends to pivot said carriage with respect to said frame means and in another position said motor tends to reciprocate said carriage relative to said frame means.
 4. For use with a pulverizer comprising a housing having a plurality of circumferentially spaced journals therein, and a removable closure adjacent each said journal, an apparatus for removing and replacing the journal assembly comprising a frame, means for removably supporting said frame on said housing adjacent the opening formed by removal of a closure, a carriage, means for connecting said carriage to a journal assembly, means for guiding said carriage for movement such as to move the journal assembly from a position within said housing to a position partly externally of said housing and back, and means for guiding said carriage for movement away from said housing such that the journal assembly can be moved clear of the housing after being moved out of said housing, and means for actuating said carriage during its movement.
 5. The combination set forth in claim 4 wherein said means for guiding said carriage for moving the journal assembly between positions within and partly externally of said housing comprises pivot means for pivotally mounting said carriage on said frame.
 6. The combination set forth in claim 5 including means releasably connecting said pivot means.
 7. The combination set forth in claim 5 wherein said means for pivoting said carriage with respect to said frame includes means for varying the position of the carriage with respect to said frame.
 8. The combination set forth in claim 6 wherein said means for guiding said carriage for movement away from said housing comprises a track on said frame and means for guiding said carriage along said track.
 9. The combination set forth in claim 8 wherein said means for actuating said carriage comprises a fluid motor extending between said frame and said carriage.
 10. The combination set forth in claim 9 including means on said frame for selectively connecting said motor to said frame such that in one position said motor tends to pivot said carriage with respect to said frame and in another position said motor tends to reciprocate said carriage along said track.
 11. The combination set forth in claim 10 wherein said means connecting said carriage to said journal assembly comprises a portion adapted to be connected to a portion of the journal assembly.
 12. The combination set forth in claim 10 wherein said means defining said track comprises spaced members on said frame, said carriage having rollers thereon engageable with said track.
 13. The combination set forth in claim 12 wherein said means for guiding said carriage along said track comprises a hold down rail removably mounted on said frame engaging said carriage and urging said carriage downwardly toward said track.
 14. For use with a pulverizer comprising a housing having a plurality of circumferentially spaced journals therein and a removable closure adjacent each said journal, the improvement comprising an apparatus for removing and replacing the journal assembly comprising a frame, means for removably supporting said frame on said housing adjacent the opening formed by removal of a closure, a carriage, means for connecting said carriage to a journal assembly, means engageable with said frame for guiding said carriage for movement such as to move the journal assembly from a position within said housing to a position partly externally of said housing and back, and means engageable with said frame for guiding said carriage for movement away from said housing such that the journal assembly can be moved clear of the housing after being moved out of said housing.
 15. The combination set forth in claim 14 wherein said means for guiding said carriage for moving the journal assembly between positions within and partly externally of said housing comprises means for pivotally mounting said carriage on said frame.
 16. The combination set forth in claim 15 including means releasably connecting said pivot means.
 17. The combination set forth in claim 16 wherein said last-mentioned means comprises axially movable engaging means interconnecting said frame and carriage.
 18. The combination set forth in claim 17 wherein said last-mentioned means comprises a pivot shaft on said frame, said axially movable member being mounted on said shaft and engageable with said carriage.
 19. The combination as set forth in claim 18 wherein said means for varying the position of the carriage with respect to said frame.
 20. The combination set forth in claim 16 wherein said means for guiding said carriage for movement away from said housing comprises a track on said frame and means for guiding said carriage along said track.
 21. The combination set forth in claim 20 including a fluid motor, means on said frame for selectively connecting to different positions said motor to said frame such that in one position said motOr tends to pivot said carriage with respect to said frame and in another position said motor tends to reciprocate said carriage along said track.
 22. The combination set forth in claim 21 wherein said means for guiding said carriage along said track comprises a hold down rail engaging said carriage and urging said carriage downwardly toward said track. 